In numerous fields such as aerospace, military, scientific research, weaponry and equipment, 5G semiconductors, and electrical and electronic engineering, environmental test equipment is widely employed to rigorously evaluate product performance. Among them, temperature and humidity chambers have become one of the most frequently used test devices across various units due to their powerful capabilities. This article will share daily maintenance tips for temperature and humidity chambers and explore how to reduce equipment failure rates and extend their service lives, thereby preventing deviations in test results caused by equipment failures.
Impact of Temperature and Humidity Environments on Products
Temperature and Humidity Environments Inducing Product Failures and Malfunctions
In the natural environment, temperature and humidity are closely interrelated, and their variations differ significantly across regions due to geographical disparities. Northern winters are cold and dry, while southern summers are hot and humid. Under humid and hot conditions, products are prone to phenomena such as water vapor adsorption, absorption, and diffusion, which can subsequently lead to a series of issues, including reduced product strength and degraded mechanical and electrical properties.
Overview of Temperature and Humidity Chambers
Temperature and humidity chambers can rapidly test the performance indicators of products and materials under high-temperature, low-temperature, or humid and hot environments. They meet the reliability and stability performance指标 (performance indicators) requirements under various harsh environmental conditions specified in standards such as GB/T2423 and GJB150A1/4, providing a basis for predicting and improving product quality and reliability. These chambers are widely applicable for simulating climatic environment tests on products in industries such as aerospace, aviation, military, electronics, electrical appliances, telecommunications, instrumentation, and automotive.
Maintenance Tips for Temperature and Humidity Chambers (Part 1)
Compressor Pressure Monitoring
Monitoring the pressure and temperature parameters of the compressor is of utmost importance. During temperature and humidity environment tests, the operating condition of the compressor directly affects the stability of the refrigeration system. By monitoring the suction and discharge pressures and temperatures of the compressor, the operating status of the equipment can be intuitively understood. If any abnormalities are detected in the compressor's pressure or temperature parameters, timely handling is required to prevent the equipment from operating with faults.
Compressor Current Monitoring
Monitoring the operating current of the compressor is a crucial aspect of refrigeration equipment maintenance. An ammeter can be used to measure the current parameters of the compressor. By comparing the measured data, it is possible to analyze whether the amount of refrigerant is reasonable, reveal any abnormalities in the internal components of the compressor, and determine whether the electrode windings are damaged.
Compressor Oil Monitoring
The oil level, oil pressure, and color of the compressor oil can provide a直观 (intuitive) reflection of the internal operating condition of the compressor. Normally, the compressor oil is clear and transparent. If it becomes turbid or black, it may be caused by internal mechanical wear, and the components need to be inspected and repaired. The oil pressure can be used to judge whether the oil circuit is unobstructed and whether the oil quantity meets the requirements. If the oil pressure is insufficient, the oil circuit needs to be cleaned or the oil quantity replenished. It is crucial to ensure that the oil sight glass is never short of oil; otherwise, it will cause damage to the compressor.
Maintenance Tips for Temperature and Humidity Chambers (Part 2)
Temperature and Humidity Change Rate Monitoring
Monitoring the heating and cooling rates as well as the humidification rate during equipment operation can help determine whether the refrigeration system, heating system, and humidification system are functioning normally. If any abnormalities are found, targeted troubleshooting and maintenance of each system should be carried out promptly to ensure the normal operation of the equipment and extend its service life.
Condenser Discharge Liquid Temperature Monitoring
The discharge liquid temperature of the condenser can reflect the cooling condition of the condenser and the amount of refrigerant filled. Under normal circumstances, the temperature of the discharge pipe is slightly higher than that of the cooling medium. If the opposite is true, it indicates that there is an abnormality in the cooling system of the condenser, and targeted maintenance is required.
Inlet and Outlet Cooling Water Temperature Monitoring
Based on the temperature difference between the inlet and outlet cooling water, the heat exchange effect of the condenser can be analyzed, and the degree of fouling in the pipelines can be understood. Through scientific maintenance and upkeep, the Mean Time Between Failures (MTBF) of the equipment can be improved, and its service life can be extended.
Extended References： Why Humidity Cannot Reach the Set Value in a Temperature-Humidity Chamber?
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